Exactly where would you be pouring concrete? From my understanding, while concrete would help resonances somewhat for isolating components on your rack, the larger benefit is to get the most performance out of your speakers. Resonances from the speaker to the floor will bounce back less, and you will notice an audible improvement in imaging, clarity and speed. Of course, you can get pretty far with good isolation solutions. But I think the bigger gain would be seen from speaker performance vs improved imaging due to improved component isolation, which would be incremental in comparison.Â
Concrete Slabs
Here I go, perhaps stirring up some controversy.
I have two turntables, both sitting on a 400lb 17th century oak chest. The chest in question sits on a suspended wood floor in a 1985 post and beam house. I just started to play Mahler's 9th (DG/Guilini/CSO) on an SME 10 with an Ortofon Cadenza Bronze. It sounds as it should. But the point is that if I stamp as hard as I can right next to the chest, there is no interruption of the sound. Even if I take a deep breath and jump with both feet off the floor—nothing, nothing at all. So, tell me, what may I gain by pouring concrete here, there, and everywhere (as I believe someone once sang)?
Is this reverence for the ultimate solidity of a foundation the same kind of daftness as when someone says an interconnect must be as thick as their wrist, even though the component may pass the same delicate signal through a PCB trace of minuscule cross-sectional area? What are we aiming for?